61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
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*
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* Based on the linux kernel JZ4740 serial support:
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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*
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* This file is part of barebox.
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* See file CREDITS for list of people who contributed to this project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <common.h>
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#include <ns16550.h>
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#include <io.h>
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#include <mach/devices.h>
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#define JZ_UART_SHIFT 2
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#define ier (1 << JZ_UART_SHIFT)
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#define fcr (2 << JZ_UART_SHIFT)
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static void jz_serial_reg_write(unsigned int val, unsigned long base,
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unsigned char reg_offset)
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{
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switch (reg_offset) {
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case fcr:
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val |= 0x10; /* Enable uart module */
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break;
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case ier:
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val |= (val & 0x4) << 2;
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break;
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default:
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break;
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}
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writeb(val & 0xff, (void *)(base + reg_offset));
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}
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struct device_d *jz_add_uart(int id, unsigned long base, unsigned int clock)
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{
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struct NS16550_plat *serial_plat;
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serial_plat = xzalloc(sizeof(*serial_plat));
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serial_plat->shift = JZ_UART_SHIFT;
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serial_plat->reg_write = &jz_serial_reg_write;
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serial_plat->clock = clock;
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return add_ns16550_device(id, base, 8 << JZ_UART_SHIFT,
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IORESOURCE_MEM_8BIT, serial_plat);
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}
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